Different Superhydrophobic Copper Surfaces Fabricated by Wet Chemical Oxidation Method and Their Anti-condensation Property

doi:10.7503/cjcu20120864

Abstract

Abstract:

Surface wet chemical oxidation is an efficient method to prepare nanostructure on copper foils toward realizing surface superhydrophobic property. However, the current studies mainly focus on the oxidation results but not on the process of oxidation reaction. Moreover, the characterization for superhydrophobicity is only by contact angle measurement. In this paper, three types of oxidants including K₂S₂O₈, (NH₄)₂S₂O₈ and ammonia were separately applied to nano roughen copper surfaces. After been treated with fluorin containing silane, all as-prepared surfaces appeared superhydrophobic property but some showed strong resistance to vapor condensation while some did not. The influence of oxidant types on the resulting morphology was compared. The nanostructure growth was believed complying with the following procedure: copper oxidation, CuO hydrolysis, Cu(OH)₂ complexation/dissolution, Cu(OH)₂ re-deposition and crystal directional growth. The vapor condensation resistances of as-prepared superhydrophobic surfaces with different nanostructures, e.g., microscopic mechanism of spontaneous motion of condensate droplets on them, were analyzed. It shows that only nanostructures with narrow space and high perpendicularity cause the obvious spontaneous motion of condensate droplets on them.

Key words: Copper surface, Wet chemical oxidation, Reaction mechanism, Superhydrophobicity, Vapor condensation

CLC Number:

O647
O614

TrendMD:

PANG Yi-Chuan, ZHAO Ying, FENG Jie. Different Superhydrophobic Copper Surfaces Fabricated by Wet Chemical Oxidation Method and Their Anti-condensation Property[J]. Chem. J. Chinese Universities, 2013, 34(4): 919.

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